From:	"A. Sinan Unur" <asu1 AT c-o-r-n-e-l-l DOT edu>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Problem with malloc/free
Date:	2 Mar 2003 16:04:00 GMT
Organization:	Cornell University
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Sergio Aguayo <sergioag AT ec-red DOT com> wrote in news:3E6225AD DOT 1341CC2B AT ec-
red.com:

> The problem is the following: i'm using DJGPP (the version available
> right now), i'm using malloc with an array of pointers (20 char *) for
> loading a file (a total of 20 files at once). The problem comes when i
> call free to release that memory, there occures a SIGSEGV signal. I'm
> also using allegro.

without some code that we can compile and diagnose, there is not much we 
can do.

however, you may have only allocated memory for the pointers, and nothing 
for those pointers to point to.

int i;

char **ptr_array = malloc(20 * sizeof(char *));
/* check if malloc returned NULL and handle the error */
for(i = 0; i != 20; ++i)
{
  ptr_array[i] = malloc(some space);
  /* check if malloc returned NULL and handle the error */
}

the codeabove was typed directly into the newsreader, and not tested.

-- 
A. Sinan Unur
asu1 AT c-o-r-n-e-l-l DOT edu
Remove dashes for address
Spam bait: mailto:uce AT ftc DOT gov

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